Extracellular polymeric substances (EPS) produced by microorganisms have a key role in the sedimentary compartment, e.g. promoting aggregation and biostabilisation of sediment particles increasing chemical reactivity at water/sediment interface. Therefore, proper extraction methods are needed to study this EPS matrix. In work, nine based on physical (centrifugation, sonication), (sodium hydroxi...

Harmful phytoplankton species become dominant by increasing with the change of trophic conditions in aquatic environments that are under pressure many environmental problems such as pollution, overfishing, invasive species, and climate change. The overgrowth these harmful is often referred to algae growth or algal bloom, a result; high amount extracellular polymeric organic matter secreted from...

An acidophilic metal-resistant bacterial strain, Acidomyces acidothermus (A. acidothermus), was isolated and identified by morphology, physiology, biochemistry, 16S rDNA. A. culture conditions were optimized response surface methodology (RSM). Results showed that with a temperature of 40 °C, pH 3 in 9k medium, rotation speed 140 r/min, the copper leaching rate reached highest value 39.8%. Furth...

In this paper, it is presented a review about applications of biofilms in the degradation of contaminants in industrial effluents. Biofilms are typically comprised of water, microorganisms, extracellular polymeric substances (EPS), retained particles and dissolved and adsorbed substances. Water is the most significant fraction of the total mass of the biofilm, and it can vary from 70 to 95%. Po...

Cyanobacterial Extracellular Polymeric Substances(EPS) play an important physiological role in mat formation and stress tolerance during adverse conditions. They are highly heterogeneous polymers containing a number of distinct polysaccharides and non carbohydrate constituents including proteins, phospholipids and nucleic acids. EPSs are therefore regarded as abundant source of structurally div...

Bacterial biofilms relieve themselves from external stresses through internal rearrangement, as mathematically modeled in many studies, but never microscopically visualized for their underlying microbiological processes. The aim of this study was to visualize rearrangement processes occurring in mechanically deformed biofilms using confocal-laser-scanning-microscopy after SYTO9 (green-fluoresce...

Biofilms, in which cells attach to surfaces and secrete slime (polymeric substances), are central to microbial life. Biofilms are often thought to require high levels of cooperation because extracellular polymeric substances are a shared resource produced by one cell that can be used by others. Here we examine this hypothesis by using a detailed individual-based simulation of a biofilm to inves...

A bacterial isolate (strain JS-2) characterized as Bacillus sp. was challenged with high concentrations of toxic selenite ions. The microbe was found to transform the toxic, soluble, colorless selenite (SeO(3)(2-)) oxyions to nontoxic, insoluble, red elemental selenium (Se(0)). This process of biotransformation was accompanied by cytoplasmic and surface accumulation of electron dense selenium (...

Some bacteria utilize (semi)conductive iron-oxide minerals as conduits for extracellular electron transfer (EET) to distant, insoluble electron acceptors. A previous study demonstrated that microbe/mineral conductive networks are constructed in soil ecosystems, in which Geobacter spp. share dominant populations. In order to examine how (semi)conductive iron-oxide minerals affect EET paths of Ge...